半刚性基层沥青路面基面层粘结材料抗剪性能分析

Test Analysis on Shear Performance for Interlayer Bond of Base and Surface in Semi-rigid Base Pavement

基面层间粘结材料的单位用量对层间抗剪性能影响较大。通过直剪试验,选取基质沥青、SBS改性沥青分别与集料结合形成的4种不同下封层进行了抗剪性能对比。结果表明：SBS改性沥青＋碎石作为层间结合料时抗剪性能最好。针对SBS改性沥青＋碎石封层,选取不同粒径的碎石进行比较,室内外试验结果表明：碎石粒径在13.2~16.0 mm时抗剪强度最大,达到0.28 MPa。

Unit dosage of interlayer bond of base and surface will affect shear performance greatly.Based on direct shearing test,the paper completed shear performance comparison on four seal coats which included matrix asphalt and SBS modified bitumen bonded aggregate.The results showed that the best shear performance is provided by SBS modified bitumen＋gravel.And according to the seal coat of SBS modified bitumen＋gravel,the gravel of different partical size is compared,the results from indoor and outdoor tests show that the max shear stress is provided by 13.2～16.0 mm gravel and the value is 0.28 MPa.